I'm Back.
The 4 320Gb drives in my 4000 work fine, with one exception. Unfortuantely for my usage this little glitch is unacceptable. I took a snapshot of the network usage durring a backup of the snap (so I can reconfigure it.) Notice those regular downward spikes? Here they are every 140 seconds, at the radio station they were every 30 seconds - or is my memory going?
This is on my home network. The same thing happend at the radio station (but every 30 seconds - or is my memory going?) When playing music from the snap, even with very little useage ~32K/second, there would be these dropouts, and the audio would stop for .5-2 seconds.
The strange thing is that it's so regular. Exactly every N seconds. I'm looking for anyone else that can confirm or deny this. All you need is a transfer of two minutes to notice the pattern in a network monitor like taskmanager or analogx netstat live.
Once the backup is done, I'm going to mirror the to sets of drives.